qet = expected total water flow (l/s)
qnl = demand of largest consumer (l/s)
Σqn = total theoretical water flow - all fixtures summarized (l/s)
Note that minimum expected total water flow can never be less than the demand from the largest fixture. This equation is valid for ordinary systems with consumption patterns like
Be aware when using the equation for systems serving large groups of people where the use is intermittent, like in
For these kind of applications, like a wardrobe, it is likely that all showers are used at the same time. Using the formula blindly would result in insufficient supply lines.
If the theoretical demand from all fixtures in a nursing home adds up to 50 l/s and the larges fixture requires 0.4 l/s, the expected water supply demand can be estimated like
qet = (0.4 l/s) + 0.015 ((50 l/s) - (0.4 l/s)) + 0.17 ((50 l/s) - (0.4 l/s))1/2
= 2.3 (l/s)
Expected demand for a supply system at different total theoretical demand can based on the formula above be expressed as
|Total Theoretical Demand Summarized|
The maximum fixture load is 0.2 liter/s.
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